更新时间:2023-11-21 18:07:10
一个简单的选择是在替换之前检查匹配:
A simple option is to check for matches before you replace:
var regex = /i/g;
var newStr = str;
var replaced = str.search(regex) >= 0;
if(replaced){
newStr = newStr.replace(regex, '!');
}
如果你也不想这样,你可以滥用 replace
回调来一次性实现:
If you don't want that either, you can abuse the replace
callback to achieve that in a single pass:
var replaced = false;
var newStr = str.replace(/i/g, function(token){replaced = true; return '!';});